Solana: surface the instruction discriminator in jupiter_swap and orca_whirlpool

[prasanna-anchorage]

Problem

jupiter_swap and orca_whirlpool are Anchor/IDL presets that do not surface the instruction discriminator in their expanded view, unlike every other Anchor preset (drift, kamino_, meteora_, metadao_*, jupiter_{perps,earn,borrow}, exponent_finance, onre_app, neutral_trade, squads_multisig, swig_wallet, dflow_aggregator).

They are currently grandfathered into DISCRIMINATOR_ALLOWLIST in chain_parsers/visualsign-solana/tests/preset_conventions.rs.

Fix

Add to each preset's expanded fields:

expanded_fields.push(create_text_field("Discriminator", &parsed.discriminator)?);

Then remove jupiter_swap and orca_whirlpool from DISCRIMINATOR_ALLOWLIST and update any affected fixtures/tests.

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